JP2009114628A - Leader and pile driving attachment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a weight-saved leader and a pile driving attachment using the leader, in a pile driver in which a drilling unit is mounted on the one side of the leader and in which a holding device for a prefabricated pipe is mounted on the other side. <P>SOLUTION: This leader 1 is formed in such a shape as to have an H-shaped horizontal cross section which comprises a vertical plate portion 1b directed in the longitudinal direction of a pile driver body, and horizontal plate portions 1c and 1d integrally provided in the front and rear of the vertical plate portion 1b, respectively. The drilling unit 2 with an auger driving device for driving an auger 24 for the excavation of a pit is ascendably/descendably mounted on the one side of the leader 1. The holding device 3 for holding the prefabricated pile 25 erected in the pit drilled by the auger 24 is ascendably/descendably mounted on the other side thereof. The horizontal width of the second horizontal plate portion 1c is set smaller than that of the first horizontal plate portion 1d. The horizontal plate portion 1c is narrowed to reduce the weight of the leader and by extension reduce the weight of the pile driving attachment. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is attached to a front portion of a pile driving machine main body, has a flat cross-sectional shape of an H shape, a drilling device is mounted on one side, and a prefabricated pile gripping device is mounted on the other side, and the reader It relates to the pile driving attachment used.

  As a conventional pile driving machine for constructing an existing pile, there is one disclosed in Patent Document 1, for example. This pile driver attaches a leader to the front part of the pile driver main body, attaches a drilling device to this leader so that it can be lifted by a lifting device, rotates a screw auger of the drilling device to drill a vertical hole in the ground, Subsequently, instead of the screw auger, the chuck device of the excavator holds the existing pile and pushes the excavator along the leader to construct the pile. Instead of replacing such a screw auger and prefabricated pile, a pile driver dedicated to the screw auger and a pile driver dedicated to the prefabricated pile are provided, and both pile drivers are operated in parallel to perform pile driving work. Sometimes.

JP 2001-31149 A

  As described above, the conventional pile driver performs the pile driving work by replacing the screw auger and the existing pile with the auger driving device in one pile driver, or uses two pile drivers. It was. However, when replacing the screw auger and the existing pile, there is a problem that the replacement work is troublesome and the work efficiency is poor. On the other hand, in the case of using two pile drivers, there is a problem that pile driving work in a narrow place becomes difficult and two pile drivers are required, so that the equipment cost increases.

  In order to solve such a problem, a pile driver equipped with a drilling device having screw augers on the left and right sides of one leader and a holding device for an existing pile has been developed. When performing pile driving work with this pile driver, first the drill auger is rotated while lowering the excavator mounted on one side of the leader to excavate the vertical hole, and then the excavator is lifted together with the screw auger, Pull out the auger. Then, without removing the excavator from the leader, the leader is turned by the turning device of the pile driver main body, and the pre-made pile grasped by the grasping device is positioned on the excavated vertical hole. Then, the holding device is lowered along the leader to push the pile.

  The leader of such a pile driver is configured as shown in the horizontal sectional view of FIG. In FIG. 11, 1A is a leader, 2 is a digging apparatus mounted on one side of the leader so as to be able to move up and down, and 3 is a holding device for a prefabricated pile mounted on the other side of the reader 1A so as to be able to move up and down. The excavating device 2 and the gripping device 3 have lifting and lowering motors 4A and 4B, respectively. The leader 1A has a horizontal cross-sectional shape of a vertical plate portion (corresponding to an H-shaped steel web) 1b and lateral plate portions (corresponding to H-shaped steel flanges) 1c and 1d before and after the horizontal plate portion 1c. Guide rails 5a and 5b are provided on one side of 1d to guide the excavator 2 so as to be movable up and down, and guide rails 5c and 5d are provided on the other side of the horizontal plate portions 1c and 1d to guide the gripping device 3 so that it can be lifted and lowered. It is done. The widths of the front and rear horizontal plate portions 1c and 1d are the same. Reference numerals 31a and 31b are guide gibbles which are attached to the excavating device 2 and the gripping device 3 and are slidably engaged along the guide rails 5a, 5b and 5c, 5d.

  In a pile driving machine equipped with such a leader, the weight of the leader 1A is required to be as light as possible in order to reduce the burden on the trailer during transportation and to reduce the size and the burden on the hydraulic cylinder for raising and lowering the leader. For example, the pile driver is tilted backwards during transportation, and is laid down on the pile driver body for transportation. In order to reduce the weight during transportation and to reduce the load on the hydraulic cylinder that undulates the leader, the leader The weight of 1A is preferably as light as possible.

  In view of the above points, the present invention provides a pile driving machine in which an excavator is mounted on one side of a leader and a gripping device for an existing pile is mounted on the other side. The purpose is to provide an attachment.

The leader of claim 1 is attached to the front portion of the pile driving machine main body, and a drilling device having an auger driving device for driving a vertical hole drilling auger is mounted on one side so as to be movable up and down, and the other side is drilled by an auger. In a reader that attaches a gripping device that grips an existing pile built in a vertical hole that can be moved up and down,
A vertical plate facing the front and rear direction of the pile driver main body,
A first horizontal plate portion having a front central portion fixed to a rear end of the vertical plate portion;
A rear central portion is fixed to the front end of the vertical plate portion, a second horizontal plate portion having a width in the left-right direction narrower than the first horizontal plate portion, and
A guide rail for guiding an excavator fixed to one end of the first horizontal plate and one end of the second horizontal plate,
A gripper guide rail fixed to the other side end of the first horizontal plate part and the other side end of the second horizontal plate part, and
The interval between the guide rails provided at both ends of the second horizontal plate portion is narrower than the interval between the guide rails provided at both end portions of the first horizontal plate portion.

An attachment for pile driving according to claim 2 comprises the leader according to claim 1, wherein the position of the shaft center of the auger of the excavator is provided on the lift frame of the excavator with the axis centered in the front-rear direction. It is characterized by being closer to the center of the reader than directly below the motor shaft.

The attachment for pile driving of Claim 3 is provided with the leader of Claim 1, or is the attachment for pile driving of Claim 2.
The guide gib provided before and after the excavator and the guide gib provided before and after the gripping device are configured in the same type,
The positions of the front and rear guide gibs relative to the lifting frames of the excavator and the gripping device are shifted so that the distance between the guide gibs on the front side of the excavator and the gripping device is narrower than the interval between the guide gibbons on the rear side. It is installed.

  According to the first aspect of the present invention, since the width of the second horizontal plate portion is narrower than that of the first horizontal plate portion, the leader is reduced in weight, and the second horizontal plate portion is the front horizontal plate portion. The distance between the guide rails provided at both ends of the horizontal plate portion is narrower than that at the rear side (that is, the distance between the front guide gibs of the excavator and the gripping device mounted on these guide rails is set between the rear guide gibs. As a result, the excavating device and the lifting device can be arranged close to the center of the reader, and as a result, the torsional moment applied to the reader can be reduced, resulting in a certain degree of reader strength. While ensuring, the reader can be reduced in size and weight.

  Moreover, with the downsizing of such a leader, the configuration of the entire pile driving attachment including the excavating device and the gripping device can be reduced in size and weight. For this reason, it is possible to reduce the weight of the leader operating hydraulic cylinder and the leader mounting device such as tilting the leader, and to reduce the size and weight of the pile driving machine, and to reduce the price associated therewith. In addition, due to the miniaturization of the leader and the pile driving attachment, it is possible to cope with a narrow site. Moreover, since the weight reduction of the whole pile driver can also be achieved, transportation becomes easy and the burden on the leader actuating hydraulic cylinder and the pile driver main body can be reduced.

  According to the second aspect of the present invention, the excavator is moved toward the center of the leader to form the periphery of the leader, so that the leader twisting moment during the operation of the excavator can be reduced. Small and lightweight. In addition, it is possible to facilitate work in a narrow place, facilitate transportation, and reduce the price.

  According to the invention of claim 3, in the pile driving attachment provided with the leader of claim 1 or the pile driving attachment of claim 2, the guide gibbles before and after the excavating device and the guide gibbons before and after the gripping device are made the same type. Economics can be achieved by sharing parts.

  1 and 2 are a side view and a front view of a pile driving machine showing an embodiment of the present invention, respectively. Reference numeral 1 denotes a leader, and 6 denotes a pile driver main body to which the leader 1 is attached. The pile driver main body 6 includes a crawler type traveling body 7, a revolving body 9 installed thereon via a revolving device 8, a hydraulic power unit 10 and an operator cab 11 mounted on the revolving body 9. The reader 1 is attached to the front portion of the swivel body 9 by a reader attachment device 12.

  The reader attachment device 12 has a front frame 13 that protrudes and is attached to the front portion of the swivel body 9. As shown in FIG. 3, a left / right swing frame 15 is mounted on a front frame 13 so as to be swingable left / right by a hydraulic cylinder 14 for adjusting the left / right tilt of the reader 1. A leader support frame 18 is attached to the left and right swing frame 15 so as to be rotatable from a standing posture to a backward lying posture by a hydraulic cylinder 17 for tilting back and forth around a pin 16. Reference numeral 19 denotes an elevating frame attached to the leader support frame 18 so as to be movable up and down, and 21 denotes a leader elevating hydraulic cylinder provided between the elevating frame 19 and the reader support frame 18. The reader 1 is fixed to the lifting frame 19. When the trailer is laid down and transported by trailer, the lifting frame 19 contracts the hydraulic cylinder 21 so that the leader 1 is positioned as far as possible in front of the pile driver main body 6 and piles on the trailer with a good weight balance. It is provided to mount the machine. Reference numerals 22 denote outriggers provided on the left and right of the front frame 13 and on the left and right of the rear portion of the revolving unit 9. The outrigger 22 is configured to stably support the pile driver main body 6 and the reader 1 by pressing the landing ground against the ground by extension of a hydraulic cylinder provided therein.

  As shown in FIGS. 1 and 2, the excavator 2 for removably attaching the screw auger 24 is attached to one side of the leader 1, and the gripping device 3 for the pre-made pile 25 is attached to the other side. As shown in FIG. 4, the horizontal cross-sectional shape of the reader 1 is an H shape. That is, the reader 1 includes a vertical plate portion 1b, a first horizontal plate portion 1d whose central portion is fixed to the rear end thereof, and a second horizontal plate portion 1c whose central portion is fixed to the front end of the vertical plate portion 1b. Become. FIG. 4 shows a comparison between the reader 1 of the present embodiment and a conventional reader. In the conventional reader 1A, the horizontal plate portions 1c and 1d have the same horizontal width (= s1). However, in the present invention, the horizontal width s3 of the first horizontal plate portion 1c is set smaller than the horizontal width s1 of the second horizontal plate portion 1d (s1> s3). 5a and 5b are guide rails of the excavator 2 provided by welding on one side (left side as viewed from the front) of the second horizontal plate portion 1c and the first horizontal plate portion 1d, and 5c and 5d are second horizontal plates. This is a guide rail for the gripping device 3 provided by welding on the other side (right side as viewed from the front) of the plate portion 1c and the first horizontal plate portion 1d.

  FIG. 5 is a horizontal sectional view of a pile driving attachment constructed using this leader, and FIG. 6 is a side view of the pile driving attachment as viewed from the excavator 2 side. The excavator 2 is equipped with a lifting motor 4A made up of a hydraulic motor at the center in the vertical direction of the lifting frame 2a. On the top and bottom of the elevating frame 2a, there are guide gibs 31a, 31b, 32a and 32b which are slidably engaged with the guide rails 5a and 5b, respectively. A drive motor 34 including a hydraulic motor that rotationally drives the screw auger 24 is attached to the lower part of the elevating frame 2a. A chuck device 36 for detachably attaching the screw auger 24 is provided below the drive motor 34. The front guide gibs 31a and 31a and the rear guide gibs 32a and 32a of the excavator 2 and the gripping device 3 are configured in the same shape, and are inverted and attached to the lift frames 2a and 3a. Further, the front and rear guide gibs 31a with respect to the lifting frames 2a and 3a of the excavator 2 and the gripping device 3 are set so that the distance between the front guide gibs 31a and 31a is narrower than the distance between the rear guide gibs 32a and 32a. , 32a are shifted in position. The lower guide gibs 31b and 32b are similarly configured.

  Sprocket chains 39 and 40 held by holding frames 37 and 38 are fixedly attached over the entire length of the reader 1 in a region surrounded by the vertical plate portion 1b and the horizontal plate portions 1c and 1d on both sides of the reader 1. . As shown in FIG. 7, these sprocket chains 39 and 40 have a double structure in which rollers are provided side by side coaxially.

  8 is a plan view for explaining a power transmission mechanism for raising and lowering the auger drive device 2, and FIG. 9 is a side view thereof. 41 is a gear fitted to the output shaft 42 of the elevating motor 4A, 43 is a gear fitted to two sprockets 44 meshing with the sprocket chain 39 and coaxial 45, and 46 is provided between the gears 41 and 43. Relay gear. As shown in FIG. 9, the sprocket 44 is provided in two upper and lower stages, and the upper and lower two-stage sprockets 44 are attached to the upper and lower frame portions of the elevating frame 2a indicated by L1 and L2 in FIG. Since the power transmission mechanism using such a gear is provided, the excavator 2 can be moved up and down by rotating the sprocket 44 while meshing with the sprocket chain 39 by the operation of the lifting motor 4A.

  The lifting / lowering device of the holding device 3 for the prefabricated pile 25 is similarly configured. However, in the gripping device 3, as shown in FIG. 2, in order to increase the pushing force of the existing pile 25, two sets of motors 4 </ b> B, 4 </ b> B are provided as lifting motors and meshed with the sprocket chain 40. Sprockets 44 are arranged one above the other. That is, the gripping device 3 is moved up and down by rotating the three sets of sprockets 44 through a gear mechanism (not shown) by the two lifting motors 4B and 4B. As shown in FIG. 5, guide gibs 31a and 31b that are slidably engaged with guide rails 5c and 5d welded to the horizontal plate portions 1c and 1d, respectively, are provided on the upper and lower frames 3a of the gripping device 3, respectively. A similar guide give (not shown) is also provided in the lower part of 3a.

  As shown in FIG. 2, at the lower part of the gripping device 3, a chuck device 50 for gripping the prefabricated pile 24, and a hydraulic pressure for applying a pushing force for moving the chuck device 50 up and down with respect to the lifting frame 3 a of the gripping device 3. A cylinder 51 is provided. 52 is a winch for lifting the existing pile 25.

  When pile driving is performed using this pile driving machine, the screw auger 24 is attached to the chuck device 36 of the excavating apparatus 2 and the screw auger 24 is rotated by the driving motor 34 and at the same time the screw is driven by the lifting motor 4A. The excavator 2 is lowered together with the auger 24 to excavate the vertical hole. In some cases, the vertical hole is excavated until the lower end of the screw auger 24 reaches the ground where the necessary support force is obtained while the screw auger 24 is added.

  Subsequently, after drilling the vertical hole to a necessary depth, the screw auger 24 is pulled out. Thereafter, the pre-made pile 25 is mounted on the chuck device 50 of the gripping device 3 with the screw auger 24 attached to the chuck device 36. And the raising / lowering motors 4B and 4B are actuated to lower the existing pile 25. Finally, the existing pile 25 is pushed into the supporting ground by the hydraulic cylinder 51 so that the necessary supporting force can be obtained.

  In addition, the thing of another structure can also be employ | adopted as the raising / lowering apparatus of the excavation apparatus 2 or the holding apparatus 3. FIG. That is, the elevating motors 4A and 4B of the above example and the driving sprocket 44 rotated by the motors are provided in the lower part of the reader 1, the driven sprockets are provided in the upper part of the reader 1, and the sprocket chains are hung around these sprockets. It is good also as a structure of the raising / lowering apparatus which connected the raising / lowering frames 2a and 3a to the sprocket chain.

  In the reader of the present invention, since the width s3 in the left-right direction of the second horizontal plate portion 1c of the reader 1 is made smaller than the width s1 of the first horizontal plate portion 1d as described above, the reader 1, the reader 1, and the excavator The pile driving attachment including 2 and the gripping device 3 can be reduced in size and weight. This will be described with reference to a comparison diagram with the conventional product in FIG.

  As shown in FIG. 4, the thicknesses of the first horizontal plate portion 1d, the vertical plate portion 1b, and the second horizontal plate portion 1c are t1, t2, and t3, respectively. The widths of the first horizontal plate portion 1d, the vertical plate portion 1b, and the second horizontal plate portion 1c are s1, s2, and s3, respectively. However, the width of the second horizontal plate portion 1c in the conventional reader 1A is s1. In the present invention, the distance between the guide rails 5a and 5c provided at both ends of the second horizontal plate portion 1c is s4, and the distance between the guide rails 5b and 5d provided at both ends of the first horizontal plate portion 1d is s5. Then, s5> s4.

An allowable torsion angle θ (per unit length) of the reader 1 is obtained by the following equation (1). However, consideration about the guide rails 5a to 5d is omitted.
θ = 3 × T × G / {s1 × (t1) ³ + s2 × (t2) ³ + s3 × (t3) ³ } (1)
Where T: torsional moment
G: Reciprocal of shear modulus, and in the case of a conventional product, s3 is s1.

The weight A (per unit length) of the corresponding reader 1 is considered as a cross-sectional area,
A = s1 × (t1) + s2 × (t2) + s3 × (t3) (2)
It becomes.

The weight W obtained by adding the weight increase of the guide gibs 31a and 32a to the weight of the reader 1 is
W = A × L + B × (L1 + L2) (3)
here,
A: Leader cross-sectional area L: Leader length B: Area L1, L2 of the extension due to eccentricity of the guide give 31a: Length of the bracket part of the lifting frame 2a (see FIG. 1)
It becomes.

  However, when the width of the second horizontal plate portion 1c is narrowed as shown in s3 as shown in FIG. 5, the B extension portion indicates the guide give 31a as Δ as shown in FIG. 11 shows an increase in width which is longer than the conventional guide gib 31a shown in FIG.

  Next, as shown in FIG. 10, an example of the ratio of the weight W given by equation (3) and the allowable reader twist angle θ and the cross-sectional area ratio when the second horizontal plate portion 1c of the reader 1 is narrowed is shown. It is shown in 1.

ここで、表１において、θ１，θ２等における付記数字の１は本発明による場合、２は従来品の場合である。また、表１中の（１）従来技術において、θ１／θ２＝１とは図４において、ｓ３＝ｓ１とした場合である。この場合は、当然Ａ１／Ａ２＝Ｗ１／Ｗ２となる。また、（２）の場合は、図１０の構成において、θ１／θ２＝０．９５１となるようにリーダ１の第２の横板部１ｃの幅ｓ３をｓ１＞ｓ３となるある値に設定した場合であり、この場合、許容できるねじり角θ２は小さくなり、強度的には弱くなる。しかしながら、リーダ重量は５．９％（Ｗ１／Ｗ２＝０．９４１）削減することができる。

Here, in Table 1, the reference numeral 1 in θ1, θ2, etc. is according to the present invention, and 2 is the case of a conventional product. In Table 1, (1) In the prior art, θ1 / θ2 = 1 means that s3 = s1 in FIG. In this case, naturally, A1 / A2 = W1 / W2. In the case of (2), in the configuration of FIG. 10, the width s3 of the second horizontal plate portion 1c of the reader 1 is set to a certain value such that s1> s3 so that θ1 / θ2 = 0.951. In this case, the allowable torsion angle θ2 becomes smaller and the strength becomes weaker. However, the reader weight can be reduced by 5.9% (W1 / W2 = 0.944).

  On the other hand, in (3), by allowing the width of the second horizontal plate portion 1c to be narrowed as s3 and increasing its thickness, the allowable torsion angle is made substantially the same as the conventional product (1.020). In this case as well, the weight can be reduced by 3.8% (W1 / W2 = 0.962).

  However, the data shown in Table 1 shows that the width of the guide give 31a is longer than that of the conventional product by Δ as shown in FIG. 10, and the axis O1 of the screw auger 24 of the excavator 2 is connected to the axis 53 of the lifting motor 4A. This is when it is almost directly below. In the gripping device 3 as well, the axis O2 of the existing pile 25 is almost directly below the axis 54 of the lifting motor 4B.

  However, as shown in the embodiment of FIG. 5, in the present invention, since the width s3 of the second horizontal plate portion 1c is narrowed, the shaft center O1 of the screw auger 24 is moved to the shaft center 53 (this shaft) of the lifting motor 4A. The core 53 is set in the front-rear direction of the pile driving machine), and can be arranged close to the center O side of the reader 1 from directly below. That is, the lifting frame 2a for attaching the drive motor 34 of the screw auger 24 and the like can be brought close to the reader 1, and even if the lifting frame 2a is brought closer to the center side of the reader 1, the lifting frame 2a is It becomes difficult to interfere with the 2nd horizontal plate part 1c. For the same reason, the gripping device 3 can be arranged close to the center O side of the reader 1 with the axis O2 of the prefabricated pile 25 directly below the axis 54 of the lifting motor 4B.

Thus, the proximity of the screw auger 24 to the leader 1 enables the cross section (weight) of the excavator 2 in the embodiment of FIG. 5 to be reduced by about 10% compared to the conventional structure. As a result, the weight ratio with respect to the conventional product in this embodiment is W1 / W2 = 0.962 × 0.9 = 0.866.
Thus, a weight reduction of 13.4% becomes possible.

  As described above, since the width of the second horizontal plate portion 1c is narrower than that of the first horizontal plate portion 1d, the reader is reduced in weight, and the second horizontal plate portion which is the front horizontal plate portion. An interval s4 between the guide rails 5a and 5c provided at both ends of 1c is narrower than an interval s5 between the guide rails 5b and 5d provided at both ends of the first horizontal plate 1d (that is, the guide rails 5a and 5c are attached to these guide rails). Since the distance between the front guide gibs 31a and 31a of the excavator 2 and the gripper 3 is smaller than the distance between the rear guide gibs 31b and 31b, as a result, the excavator 2 is disposed close to the reader center. As a result, the torsional moment applied to the reader 1 can be reduced. As a result, the reader 1 can be reduced in size and weight while securing a certain degree of strength.

  Further, along with the downsizing of the reader 1, the configuration of the entire pile driving attachment including the excavating device 2 and the gripping device 3 can be reduced in size and weight. For this reason, the hydraulic cylinders 14 and 17 for tilting the pile driving attachment including the leader 1 and the leader mounting device 12 can be reduced in weight, and the pile driver can be reduced in size and weight, and the associated price can be reduced. In addition, because of the miniaturization of the reader 1 and the pile driving attachment, it is possible to cope with a narrow site. Moreover, since the weight reduction of the whole pile driver can also be achieved, transportation becomes easy, and the burden on the leader actuating hydraulic cylinders 14, 17, 21 and the pile driver main body can be reduced.

  In addition, since the leader 1 can be reduced in size, the pile attachment including the excavating device 2 and the gripping device 3 can be reduced in size, and work in a narrow place is facilitated.

  Further, in the present embodiment, the front and rear guide gibs 31a and 31b (the same applies to 32a and 32b) of the excavating device 2 are made the same type, reversed and attached to the lifting frame 2a of the excavating device 2, and the front and rear guide gibbs of the gripping device 3 Since 31a and 31b are the same type as those before and after the excavator 2 and are inverted and attached to the lifting frame 3a of the gripping device 3, the guide gibs 31a, 31b, 32a, and 32b can be shared for economy.

It is a side view which shows one Embodiment of the pile driver by this invention. It is a front view of FIG. It is an enlarged side view of the reader attachment apparatus of FIG. It is a horizontal sectional view which shows the reader of this embodiment compared with a conventional product. It is a horizontal sectional view of the attachment for pile driving of this embodiment. FIG. 2 is an enlarged side view of the leader top of FIG. 1. It is a figure which shows the sprocket chain for raising / lowering used in this Embodiment. It is a top view of the raising / lowering apparatus of this Embodiment. It is a side view of FIG. It is a horizontal sectional view of the attachment for pile driving of other embodiments of the present invention. It is a horizontal sectional view of the conventional pile driving attachment.

Explanation of symbols

1: Reader, 1b: Vertical plate portion, 1c, 1d: Horizontal plate portion, 2: Excavation device, 2a: Lifting frame, 3: Grasping device, 3a: Lifting frame, 4A, 4B: Lifting motor, 5a to 5d: Guide rail, 6: Pile driver main body, 7: Traveling body, 8: Swivel device, 9: Swivel body, 10: Hydraulic power unit, 11: Driver's cab, 12: Leader mounting device, 13: Front frame, 14: Left and right tilt Hydraulic cylinder for adjustment, 15: left and right swing frame, 16: pin, 17: hydraulic cylinder for tilting forward and backward, 18: leader support frame, 19: lifting frame, 20: guide, 21: lifting hydraulic cylinder, 22: Outrigger, 24: Screw auger, 25: Prefabricated pile, 31a, 31b, 32a, 32b: Guide gib, 34: Drive motor, 36: Chuck device, 37, 38: Holding frame, 9,40: Sprocket Chain, 41,43,46: gear, 42: output shaft, 44: sprocket, 45: shaft, 50: chuck device, 51: hydraulic cylinder, 52: winches

Claims (3)

A built-in excavator that is attached to the front of the main body of the pile driver and has an auger drive device that drives an auger for excavating a vertical hole on one side can be moved up and down, and is built in a vertical hole excavated by an auger on the other side In the reader that attaches the gripping device that grips the pile so that it can move up and down,
A vertical plate facing the front and rear direction of the pile driver main body,
A first horizontal plate portion having a front central portion fixed to a rear end of the vertical plate portion;
A rear center portion is fixed to the front end of the vertical plate portion, a second horizontal plate portion having a narrower width in the left-right direction than the first horizontal plate portion, and
A guide rail for guiding an excavator fixed to one end of the first horizontal plate and one end of the second horizontal plate;
A gripper guide rail fixed to the other side end of the first horizontal plate part and the other side end of the second horizontal plate part, and
A reader characterized in that a distance between guide rails provided at both ends of the second horizontal plate portion is narrower than a distance between guide rails provided at both ends of the first horizontal plate portion. The leader according to claim 1, wherein the position of the axis of the auger of the excavator is positioned at the center of the leader rather than directly below the axis of the elevator motor provided on the elevator frame of the excavator with the axis in the front-rear direction. A pile driving attachment characterized by being brought to the side. In the attachment for pile driving according to claim 2, comprising the leader according to claim 1.
The guide gib provided before and after the excavator and the guide gib provided before and after the gripping device are configured in the same type,
The positions of the front and rear guide gibs relative to the lifting frames of the excavator and the gripping device are shifted so that the distance between the guide gibs on the front side of the excavator and the gripping device is narrower than the interval between the guide gibbons on the rear side. Pile-attached attachment characterized by being attached.

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